Marty Bystrom vs. Jim Hearn — Career Comparison

Looking at the career totals, Marty Bystrom and Jim Hearn are fairly close on the surface numbers. Jim Hearn posted stronger numbers in ERA (3.81 vs 4.26) and WHIP (1.372 vs 1.428). Marty Bystrom had the advantage in home runs allowed (0.58 per nine innings vs 0.83). By the career numbers, Jim Hearn had the better of this comparison — though ERA and WHIP alone don't account for era, park factors, or the defenses each pitcher worked behind.